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source: GTP/trunk/App/Demos/Vis/FriendlyCulling/src/SsaoShader.cpp @ 2884

Revision 2884, 25.1 KB checked in by mattausch, 16 years ago (diff)
found bug with lod levels made env file for shaders

Line
1	#include "SsaoShader.h"
2	#include "FrameBufferObject.h"
3	#include "RenderState.h"
4	#include "SampleGenerator.h"
5	#include "Vector3.h"
6	#include "Camera.h"
7	#include "shaderenv.h"
8
9
10	using namespace std;
11
12	static GLenum mymrt[] = {GL_COLOR_ATTACHMENT0_EXT, GL_COLOR_ATTACHMENT1_EXT, GL_COLOR_ATTACHMENT2_EXT, GL_COLOR_ATTACHMENT3_EXT};
13
14	namespace CHCDemoEngine
15	{
16
17	static CGprogram sCgSsaoProgram = NULL;
18	static CGprogram sCgGiProgram = NULL;
19
20	static CGprogram sCgDeferredProgram = NULL;
21	static CGprogram sCgAntiAliasingProgram = NULL;
22
23	static CGparameter sColorsTexCombineParam;
24	static CGparameter sSsaoTexCombineParam;
25
26	static CGparameter sColorsTexDeferredParam;
27	static CGparameter sPositionsTexDeferredParam;
28	static CGparameter sNormalsTexDeferredParam;
29
30
31	static CGprogram sCgCombinedSsaoProgram = NULL;
32	static CGprogram sCgCombinedIllumProgram = NULL;
33
34	///////////////////////////////////////7
35
36
37	static CGparameter sColorsTexParam;
38	static CGparameter sPositionsTexParam;
39	static CGparameter sNormalsTexParam;
40
41	static CGparameter sOldModelViewProjMatrixParam;
42	static CGparameter sMaxDepthParam;
43	static CGparameter sSamplesParam;
44	static CGparameter sOldTexParam;
45	static CGparameter sNoiseTexParam;
46	static CGparameter sNoiseMultiplierParam;
47	static CGparameter sExpFactorParam;
48
49
50
51	///////////////////////////////////////
52
53
54	static CGparameter sColorsTexGiParam;
55	static CGparameter sPositionsTexGiParam;
56	static CGparameter sNormalsTexGiParam;
57
58
59	static CGparameter sOldModelViewProjMatrixGiParam;
60	static CGparameter sMaxDepthGiParam;
61	static CGparameter sSamplesGiParam;
62	static CGparameter sOldSsaoTexGiParam;
63	static CGparameter sOldIllumTexGiParam;
64	static CGparameter sNoiseTexGiParam;
65	static CGparameter sNoiseMultiplierGiParam;
66	static CGparameter sExpFactorGiParam;
67
68
69	static CGparameter sColorsTexCombinedIllumParam;
70	static CGparameter sSsaoTexCombinedIllumParam;
71	static CGparameter sIllumTexCombinedIllumParam;
72
73	static CGparameter sColorsTexCombinedSsaoParam;
74	static CGparameter sSsaoTexCombinedSsaoParam;
75
76
77	////////////
78
79	static CGparameter sColorsTexAntiAliasingParam;
80	static CGparameter sNormalsTexAntiAliasingParam;
81
82	static GLuint noiseTex = 0;
83
84	// ssao random spherical samples
85	static Sample2 samples[NUM_SAMPLES];
86
87
88	static void PrintGLerror(char *msg)
89	{
90	GLenum errCode;
91	const GLubyte *errStr;
92
93	if ((errCode = glGetError()) != GL_NO_ERROR)
94	{
95	errStr = gluErrorString(errCode);
96	fprintf(stderr,"OpenGL ERROR: %s: %s\n", errStr, msg);
97	}
98	}
99
100
101	/** Generate poisson disc distributed sample points on the unit disc
102	*/
103	static void GenerateSamples()
104	{
105	static PoissonDiscSampleGenerator poisson(NUM_SAMPLES, 1.0f);
106	poisson.Generate((Sample2 *)samples);
107	}
108
109
110	static void CreateNoiseTex2D(int w, int h)
111	{
112	//GLubyte randomNormals = new GLubyte[mWidth mHeight * 3];
113	float randomNormals = new float[w h * 3];
114
115	for (int i = 0; i < w * h * 3; i += 3)
116	{
117	// create random samples on a circle
118	const float rx = RandomValue(0, 1);
119	const float theta = 2.0f * acos(sqrt(1.0f - rx));
120
121	//randomNormals[i + 0] = (GLubyte)((cos(theta) * 0.5f + 0.5f) * 255.0f);
122	//randomNormals[i + 1] = (GLubyte)((sin(theta) * 0.5f + 0.5f) * 255.0f);
123	randomNormals[i + 0] = cos(theta);
124	randomNormals[i + 1] = sin(theta);
125	randomNormals[i + 2] = 0;
126	}
127
128	glEnable(GL_TEXTURE_2D);
129	glGenTextures(1, &noiseTex);
130	glBindTexture(GL_TEXTURE_2D, noiseTex);
131
132	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
133	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
134	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
135	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
136
137	//glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, w, h, 0, GL_RGB, GL_UNSIGNED_BYTE, randomNormals);
138	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F_ARB, w, h, 0, GL_RGB, GL_FLOAT, randomNormals);
139
140	glBindTexture(GL_TEXTURE_2D, 0);
141	glDisable(GL_TEXTURE_2D);
142
143	delete [] randomNormals;
144
145	cout << "created noise texture" << endl;
146
147	PrintGLerror("noisetexture");
148	}
149
150
151	SsaoShader::SsaoShader(int w, int h, Camera *cam, float scaleFactor):
152	mWidth(w), mHeight(h),
153	mCamera(cam),
154	mScaleFactor(scaleFactor),
155	mUseTemporalCoherence(true),
156	mUseGlobIllum(false)
157	{
158	// create noise texture for ssao
159	CreateNoiseTex2D(w, h);
160
161	///////////
162	//-- the flip-flop fbos
163
164	mNewFbo = new FrameBufferObject(w, h, FrameBufferObject::DEPTH_NONE);
165
166	mNewFbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false);
167	mNewFbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false);
168
169
170	///////////////////////
171
172	mOldFbo = new FrameBufferObject(w, h, FrameBufferObject::DEPTH_NONE);
173
174	mOldFbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false);
175	mOldFbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false);
176
177	//mFbo = new FrameBufferObject(w, h, FrameBufferObject::DEPTH_NONE);
178	//mFbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false);*/
179	}
180
181
182	SsaoShader::~SsaoShader()
183	{
184	if (sCgSsaoProgram) cgDestroyProgram(sCgSsaoProgram);
185	if (sCgDeferredProgram) cgDestroyProgram(sCgDeferredProgram);
186	if (sCgSsaoProgram) cgDestroyProgram(sCgSsaoProgram);
187	if (sCgGiProgram) cgDestroyProgram(sCgGiProgram);
188	if (sCgAntiAliasingProgram) cgDestroyProgram(sCgAntiAliasingProgram);
189
190	DEL_PTR(mNewFbo);
191	DEL_PTR(mOldFbo);
192	//DEL_PTR(mFbo);
193
194	glDeleteTextures(1, &noiseTex);
195	}
196
197
198	void SsaoShader::SetUseGlobIllum(bool useGlobIllum)
199	{
200	mUseGlobIllum = useGlobIllum;
201	}
202
203
204	void SsaoShader::SetUseTemporalCoherence(bool temporal)
205	{
206	mUseTemporalCoherence = temporal;
207	}
208
209
210	void SsaoShader::Init(CGcontext context)
211	{
212	sCgDeferredProgram =
213	cgCreateProgramFromFile(context,
214	CG_SOURCE,
215	"src/shaders/deferred.cg",
216	RenderState::sCgFragmentProfile,
217	"main",
218	NULL);
219
220	if (sCgDeferredProgram != NULL)
221	{
222	cgGLLoadProgram(sCgDeferredProgram);
223
224	// we need size of texture for scaling
225	sPositionsTexDeferredParam = cgGetNamedParameter(sCgDeferredProgram, "positions");
226	sColorsTexDeferredParam = cgGetNamedParameter(sCgDeferredProgram, "colors");
227	sNormalsTexDeferredParam = cgGetNamedParameter(sCgDeferredProgram, "normals");
228	}
229	else
230	cerr << "deferred program failed to load" << endl;
231
232
233	///////////////
234
235	sCgSsaoProgram =
236	cgCreateProgramFromFile(context,
237	CG_SOURCE,
238	"src/shaders/ssao.cg",
239	RenderState::sCgFragmentProfile,
240	"main",
241	NULL);
242
243	if (sCgSsaoProgram != NULL)
244	{
245	cgGLLoadProgram(sCgSsaoProgram);
246
247	// we need size of texture for scaling
248	sPositionsTexParam = cgGetNamedParameter(sCgSsaoProgram, "positions");
249	sColorsTexParam = cgGetNamedParameter(sCgSsaoProgram, "colors");
250	sNormalsTexParam = cgGetNamedParameter(sCgSsaoProgram, "normals");
251	sNoiseTexParam = cgGetNamedParameter(sCgSsaoProgram, "noiseTexture");
252	sNoiseMultiplierParam = cgGetNamedParameter(sCgSsaoProgram, "noiseMultiplier");
253
254	sOldModelViewProjMatrixParam = cgGetNamedParameter(sCgSsaoProgram, "oldModelViewProj");
255	sMaxDepthParam = cgGetNamedParameter(sCgSsaoProgram, "maxDepth");
256	sExpFactorParam = cgGetNamedParameter(sCgSsaoProgram, "expFactor");
257
258	sOldTexParam = cgGetNamedParameter(sCgSsaoProgram, "oldTex");
259
260	cgGLSetParameter1f(sNoiseMultiplierParam, RandomValue(3.0f, 17.0f));
261
262	// generate samples for ssao kernel
263	GenerateSamples();
264
265	sSamplesParam = cgGetNamedParameter(sCgSsaoProgram, "samples");
266	//cgSetArraySize(sSamplesParam, NUM_SAMPLES);
267	//cgCompileProgram(sCgSsaoProgram);
268
269	cgGLSetParameterArray2f(sSamplesParam, 0, NUM_SAMPLES, (const float *)samples);
270	}
271	else
272	cerr << "ssao program failed to load" << endl;
273
274	sCgGiProgram =
275	cgCreateProgramFromFile(context,
276	CG_SOURCE,
277	"src/shaders/globillum.cg",
278	RenderState::sCgFragmentProfile,
279	"main",
280	NULL);
281
282	if (sCgGiProgram != NULL)
283	{
284	cgGLLoadProgram(sCgGiProgram);
285
286	// we need size of texture for scaling
287	sPositionsTexGiParam = cgGetNamedParameter(sCgGiProgram, "positions");
288	sColorsTexGiParam = cgGetNamedParameter(sCgGiProgram, "colors");
289	sNormalsTexGiParam = cgGetNamedParameter(sCgGiProgram, "normals");
290	sNoiseTexGiParam = cgGetNamedParameter(sCgGiProgram, "noiseTexture");
291	sNoiseMultiplierGiParam = cgGetNamedParameter(sCgGiProgram, "noiseMultiplier");
292
293	sOldModelViewProjMatrixGiParam = cgGetNamedParameter(sCgGiProgram, "oldModelViewProj");
294	sMaxDepthGiParam = cgGetNamedParameter(sCgGiProgram, "maxDepth");
295	sExpFactorGiParam = cgGetNamedParameter(sCgGiProgram, "expFactor");
296
297	sSamplesGiParam = cgGetNamedParameter(sCgGiProgram, "samples");
298
299	sOldSsaoTexGiParam = cgGetNamedParameter(sCgGiProgram, "oldSsaoTex");
300	sOldIllumTexGiParam = cgGetNamedParameter(sCgGiProgram, "oldIllumTex");
301
302	// generate samples for ssao kernel
303	GenerateSamples();
304	cgGLSetParameterArray2f(sSamplesGiParam, 0, NUM_SAMPLES, (const float *)samples);
305
306	cgGLSetParameter1f(sNoiseMultiplierGiParam, RandomValue(3.0f, 17.0f));
307	}
308	else
309	cerr << "globillum program failed to load" << endl;
310
311	sCgCombinedIllumProgram =
312	cgCreateProgramFromFile(context,
313	CG_SOURCE,
314	"src/shaders/globillum.cg",
315	RenderState::sCgFragmentProfile,
316	"combine",
317	NULL);
318
319	if (sCgCombinedIllumProgram != NULL)
320	{
321	cgGLLoadProgram(sCgCombinedIllumProgram);
322
323	sColorsTexCombinedIllumParam = cgGetNamedParameter(sCgCombinedIllumProgram, "colors");
324	sSsaoTexCombinedIllumParam = cgGetNamedParameter(sCgCombinedIllumProgram, "ssaoTex");
325	sIllumTexCombinedIllumParam = cgGetNamedParameter(sCgCombinedIllumProgram, "illumTex");
326	}
327	else
328	cerr << "combined illum program failed to load" << endl;
329
330
331	sCgCombinedSsaoProgram =
332	cgCreateProgramFromFile(context,
333	CG_SOURCE,
334	"src/shaders/ssao.cg",
335	RenderState::sCgFragmentProfile,
336	"combine",
337	NULL);
338
339	if (sCgCombinedSsaoProgram != NULL)
340	{
341	cgGLLoadProgram(sCgCombinedSsaoProgram);
342
343	sColorsTexCombinedSsaoParam = cgGetNamedParameter(sCgCombinedSsaoProgram, "colors");
344	sSsaoTexCombinedSsaoParam = cgGetNamedParameter(sCgCombinedSsaoProgram, "ssaoTex");
345	}
346	else
347	cerr << "combied illum program failed to load" << endl;
348
349
350	sCgAntiAliasingProgram =
351	cgCreateProgramFromFile(context,
352	CG_SOURCE,
353	"src/shaders/antialiasing.cg",
354	RenderState::sCgFragmentProfile,
355	"main",
356	NULL);
357
358	if (sCgAntiAliasingProgram != NULL)
359	{
360	cgGLLoadProgram(sCgAntiAliasingProgram);
361
362	sColorsTexAntiAliasingParam = cgGetNamedParameter(sCgAntiAliasingProgram, "colors");
363	sNormalsTexAntiAliasingParam = cgGetNamedParameter(sCgAntiAliasingProgram, "normals");
364	}
365	else
366	cerr << "antialiasing program failed to load" << endl;
367
368	PrintGLerror("init");
369	}
370
371
372	void SsaoShader::Render(FrameBufferObject *fbo,
373	const Matrix4x4 &oldProjViewMatrix,
374	float expFactor)
375	{
376
377	// switch roles of old and new fbo
378	// the algorihm uses two input fbos, where the one
379	// contais the color buffer from the last frame,
380	// the other one will be written
381	swap(mNewFbo, mOldFbo);
382
383	FrameBufferObject::Release();
384
385	cgGLEnableProfile(RenderState::sCgFragmentProfile);
386
387	glDisable(GL_ALPHA_TEST);
388	glDisable(GL_TEXTURE_2D);
389	glDisable(GL_LIGHTING);
390
391	glPushAttrib(GL_VIEWPORT_BIT);
392	glViewport(0, 0, mWidth, mHeight);
393
394	glMatrixMode(GL_PROJECTION);
395	glPushMatrix();
396	glLoadIdentity();
397
398	glMatrixMode(GL_MODELVIEW);
399	glPushMatrix();
400	glLoadIdentity();
401
402	const float offs = 0.5f;
403	glOrtho(-offs, offs, -offs, offs, 0, 1);
404
405	FirstPass(fbo);
406
407	if (!mUseGlobIllum)
408	{
409	ComputeSsao(fbo, expFactor, oldProjViewMatrix);
410	CombineSsao(fbo);
411	}
412	else
413	{
414	ComputeGlobIllum(fbo, expFactor, oldProjViewMatrix);
415	CombineIllum(fbo);
416	}
417
418	AntiAliasing(fbo);
419
420	glEnable(GL_LIGHTING);
421	glDisable(GL_TEXTURE_2D);
422
423	glMatrixMode(GL_PROJECTION);
424	glPopMatrix();
425
426	glMatrixMode(GL_MODELVIEW);
427	glPopMatrix();
428
429	glPopAttrib();
430
431	cgGLDisableProfile(RenderState::sCgFragmentProfile);
432	}
433
434
435	void SsaoShader::ComputeSsao(FrameBufferObject *fbo,
436	float expFactor,
437	const Matrix4x4 &oldProjViewMatrix
438	)
439	{
440	cgGLSetMatrixParameterfc(sOldModelViewProjMatrixParam, (const float *)oldProjViewMatrix.x);
441
442	GLuint colorsTex = fbo->GetColorBuffer(3)->GetTexture();
443	GLuint positionsTex = fbo->GetColorBuffer(1)->GetTexture();
444	GLuint normalsTex = fbo->GetColorBuffer(2)->GetTexture();
445
446	if (1)
447	{
448	// generate mip map levels for position texture
449	glBindTexture(GL_TEXTURE_2D, positionsTex);
450	glGenerateMipmapEXT(GL_TEXTURE_2D);
451	}
452
453
454	// read the second buffer, write to the first buffer
455	mNewFbo->Bind();
456	glDrawBuffers(1, mymrt);
457
458
459	GLuint oldTex = mOldFbo->GetColorBuffer(0)->GetTexture();
460
461	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
462
463	cgGLEnableProfile(RenderState::sCgFragmentProfile);
464	cgGLBindProgram(sCgSsaoProgram);
465
466	cgGLSetTextureParameter(sPositionsTexParam, positionsTex);
467	cgGLEnableTextureParameter(sPositionsTexParam);
468
469	cgGLSetTextureParameter(sColorsTexParam, colorsTex);
470	cgGLEnableTextureParameter(sColorsTexParam);
471
472	cgGLSetTextureParameter(sNormalsTexParam, normalsTex);
473	cgGLEnableTextureParameter(sNormalsTexParam);
474
475	cgGLSetTextureParameter(sNoiseTexParam, noiseTex);
476	cgGLEnableTextureParameter(sNoiseTexParam);
477
478	cgGLSetTextureParameter(sOldTexParam, oldTex);
479	cgGLEnableTextureParameter(sOldTexParam);
480
481	cgGLSetParameter1f(sMaxDepthParam, mScaleFactor);
482
483	if (mUseTemporalCoherence)
484	{
485	cgGLSetParameter1f(sNoiseMultiplierParam, RandomValue(3.0f, 17.0f));
486	cgGLSetParameter1f(sExpFactorParam, expFactor);
487
488
489	// q: should we generate new samples or only rotate the old ones?
490	// in the first case, the sample patterns look nicer, but the kernel
491	// needs longer to converge
492	GenerateSamples();
493	cgGLSetParameterArray2f(sSamplesParam, 0, NUM_SAMPLES, (const float *)samples);
494	}
495	else
496	{
497	cgGLSetParameter1f(sExpFactorParam, 1.0f);
498	}
499
500	Vector3 tl, tr, bl, br;
501	ComputeViewVectors(tl, tr, bl, br);
502
503	glColor3f(1.0f, 1.0f, 1.0f);
504
505	glBegin(GL_QUADS);
506
507	// note: slightly larger texture hides ambient occlusion error on border but costs resolution
508	//const float new_offs = 0.55f;
509	const float new_offs = 0.5f;
510
511	glColor3f(bl.x, bl.y, bl.z); glTexCoord2f(0, 0); glVertex3f(-new_offs, -new_offs, -0.5f);
512	glColor3f(br.x, br.y, br.z); glTexCoord2f(1, 0); glVertex3f( new_offs, -new_offs, -0.5f);
513	glColor3f(tr.x, tr.y, tr.z); glTexCoord2f(1, 1); glVertex3f( new_offs, new_offs, -0.5f);
514	glColor3f(tl.x, tl.y, tl.z); glTexCoord2f(0, 1); glVertex3f(-new_offs, new_offs, -0.5f);
515
516	glEnd();
517
518	cgGLDisableTextureParameter(sColorsTexParam);
519	cgGLDisableTextureParameter(sPositionsTexParam);
520	cgGLDisableTextureParameter(sNormalsTexParam);
521	cgGLDisableTextureParameter(sNoiseTexParam);
522	cgGLDisableTextureParameter(sOldTexParam);
523
524
525	FrameBufferObject::Release();
526
527	PrintGLerror("ssao first pass");
528	}
529
530
531	void SsaoShader::ComputeViewVectors(Vector3 &tl, Vector3 &tr, Vector3 &bl, Vector3 &br)
532	{
533	Vector3 ftl, ftr, fbl, fbr, ntl, ntr, nbl, nbr;
534
535	mCamera->ComputePoints(ftl, ftr, fbl, fbr, ntl, ntr, nbl, nbr);
536
537	#if 1 // matT: debug this!!
538
539	bl = -Normalize(nbl - fbl);
540	br = -Normalize(nbr - fbr);
541	tl = -Normalize(ntl - ftl);
542	tr = -Normalize(ntr - ftr);
543
544	#else // just take camera direction
545
546	bl = -Normalize(mCamera->GetDirection());
547	br = -Normalize(mCamera->GetDirection());
548	tl = -Normalize(mCamera->GetDirection());
549	tr = -Normalize(mCamera->GetDirection());
550
551	#endif
552
553	// normalize to 0 .. 1
554	bl = bl * 0.5f + 0.5f;
555	br = br * 0.5f + 0.5f;
556	tl = tl * 0.5f + 0.5f;
557	tr = tr * 0.5f + 0.5f;
558	}
559
560
561
562	static void SetVertex(float x, float y, float x_offs, float y_offs)
563	{
564	glMultiTexCoord2fARB(GL_TEXTURE0_ARB, x, y); // center
565	glMultiTexCoord2fARB(GL_TEXTURE1_ARB, x - x_offs, y + y_offs); // left top
566	glMultiTexCoord2fARB(GL_TEXTURE2_ARB, x + x_offs, y - y_offs); // right bottom
567	glMultiTexCoord2fARB(GL_TEXTURE3_ARB, x + x_offs, y + y_offs); // right top
568	glMultiTexCoord2fARB(GL_TEXTURE4_ARB, x - x_offs, y - y_offs); // left bottom
569
570	glMultiTexCoord4fARB(GL_TEXTURE5_ARB, x - x_offs, y, x + x_offs, y); // left right
571	glMultiTexCoord4fARB(GL_TEXTURE6_ARB, x, y + y_offs, x, y - y_offs); // top bottom
572
573	glVertex3f(x - 0.5f, y - 0.5f, -0.5f);
574	}
575
576
577	void SsaoShader::AntiAliasing(FrameBufferObject *fbo)
578	{
579	GLuint colorsTex = fbo->GetColorBuffer(0)->GetTexture();
580	GLuint normalsTex = fbo->GetColorBuffer(2)->GetTexture();
581
582	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
583
584	cgGLEnableProfile(RenderState::sCgFragmentProfile);
585	cgGLBindProgram(sCgAntiAliasingProgram);
586
587	cgGLSetTextureParameter(sColorsTexAntiAliasingParam, colorsTex);
588	cgGLEnableTextureParameter(sColorsTexAntiAliasingParam);
589
590	cgGLSetTextureParameter(sNormalsTexAntiAliasingParam, normalsTex);
591	cgGLEnableTextureParameter(sNormalsTexAntiAliasingParam);
592
593	glColor3f(1.0f, 1.0f, 1.0f);
594
595	float offs2 = 0.5f;
596
597	glBegin(GL_QUADS);
598
599	// the neighbouring texels
600	float x_offs = 1.0f / mWidth;
601	float y_offs = 1.0f / mHeight;
602
603	SetVertex(0, 0, x_offs, y_offs);
604	SetVertex(1, 0, x_offs, y_offs);
605	SetVertex(1, 1, x_offs, y_offs);
606	SetVertex(0, 1, x_offs, y_offs);
607
608	glEnd();
609
610	cgGLDisableTextureParameter(sColorsTexAntiAliasingParam);
611	cgGLDisableTextureParameter(sNormalsTexAntiAliasingParam);
612
613	PrintGLerror("antialiasing");
614	}
615
616
617	void SsaoShader::FirstPass(FrameBufferObject *fbo)
618	{
619	GLuint colorsTex = fbo->GetColorBuffer(0)->GetTexture();
620	GLuint positionsTex = fbo->GetColorBuffer(1)->GetTexture();
621	GLuint normalsTex = fbo->GetColorBuffer(2)->GetTexture();
622
623	fbo->Bind();
624
625	glDrawBuffers(1, mymrt + 3);
626
627	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
628
629	cgGLEnableProfile(RenderState::sCgFragmentProfile);
630
631	cgGLBindProgram(sCgDeferredProgram);
632
633	cgGLSetTextureParameter(sColorsTexDeferredParam, colorsTex);
634	cgGLEnableTextureParameter(sColorsTexDeferredParam);
635
636	cgGLSetTextureParameter(sPositionsTexDeferredParam, positionsTex);
637	cgGLEnableTextureParameter(sPositionsTexDeferredParam);
638
639	cgGLSetTextureParameter(sNormalsTexDeferredParam, normalsTex);
640	cgGLEnableTextureParameter(sNormalsTexDeferredParam);
641
642	glColor3f(1.0f, 1.0f, 1.0f);
643
644	const float offs = 0.5f;
645
646	glBegin(GL_QUADS);
647
648	glTexCoord2f(0, 0); glVertex3f(-offs, -offs, -0.5f);
649	glTexCoord2f(1, 0); glVertex3f( offs, -offs, -0.5f);
650	glTexCoord2f(1, 1); glVertex3f( offs, offs, -0.5f);
651	glTexCoord2f(0, 1); glVertex3f(-offs, offs, -0.5f);
652
653	glEnd();
654
655	cgGLDisableTextureParameter(sColorsTexDeferredParam);
656	cgGLDisableTextureParameter(sPositionsTexDeferredParam);
657	cgGLDisableTextureParameter(sNormalsTexDeferredParam);
658
659	cgGLDisableProfile(RenderState::sCgFragmentProfile);
660
661	FrameBufferObject::Release();
662
663	PrintGLerror("deferred shading");
664	}
665
666
667	void SsaoShader::ComputeGlobIllum(FrameBufferObject *fbo,
668	float expFactor,
669	const Matrix4x4 &oldProjViewMatrix
670	)
671	{
672	cgGLSetMatrixParameterfc(sOldModelViewProjMatrixGiParam, (const float *)oldProjViewMatrix.x);
673
674	//GLuint colorsTex = mFbo->GetColorBuffer(0)->GetTexture();
675	GLuint colorsTex = fbo->GetColorBuffer(3)->GetTexture();
676	GLuint positionsTex = fbo->GetColorBuffer(1)->GetTexture();
677	GLuint normalsTex = fbo->GetColorBuffer(2)->GetTexture();
678
679	if (1)
680	{
681	// generate mip map levels for position texture
682	glBindTexture(GL_TEXTURE_2D, positionsTex);
683	glGenerateMipmapEXT(GL_TEXTURE_2D);
684
685	// generate mip map levels for position texture
686	glBindTexture(GL_TEXTURE_2D, colorsTex);
687	glGenerateMipmapEXT(GL_TEXTURE_2D);
688	}
689
690
691	// read the second buffer, write to the first buffer
692	mNewFbo->Bind();
693	glDrawBuffers(2, mymrt);
694
695	GLuint oldSsaoTex = mOldFbo->GetColorBuffer(0)->GetTexture();
696	GLuint oldIllumTex = mOldFbo->GetColorBuffer(1)->GetTexture();
697
698	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
699
700	cgGLEnableProfile(RenderState::sCgFragmentProfile);
701	cgGLBindProgram(sCgGiProgram);
702
703	cgGLSetTextureParameter(sPositionsTexGiParam, positionsTex);
704	cgGLEnableTextureParameter(sPositionsTexGiParam);
705
706	cgGLSetTextureParameter(sColorsTexGiParam, colorsTex);
707	cgGLEnableTextureParameter(sColorsTexGiParam);
708
709	cgGLSetTextureParameter(sNormalsTexGiParam, normalsTex);
710	cgGLEnableTextureParameter(sNormalsTexGiParam);
711
712	cgGLSetTextureParameter(sNoiseTexGiParam, noiseTex);
713	cgGLEnableTextureParameter(sNoiseTexGiParam);
714
715	cgGLSetTextureParameter(sOldSsaoTexGiParam, oldSsaoTex);
716	cgGLEnableTextureParameter(sOldSsaoTexGiParam);
717
718	cgGLSetTextureParameter(sOldIllumTexGiParam, oldIllumTex);
719	cgGLEnableTextureParameter(sOldIllumTexGiParam);
720
721	cgGLSetParameter1f(sMaxDepthGiParam, mScaleFactor);
722
723
724	if (mUseTemporalCoherence)
725	{
726	cgGLSetParameter1f(sNoiseMultiplierGiParam, RandomValue(3.0f, 17.0f));
727	cgGLSetParameter1f(sExpFactorGiParam, expFactor);
728
729	// q: should we generate new samples or only rotate the old ones?
730	// in the first case, the sample patterns look nicer, but the kernel
731	// needs longer to converge
732	GenerateSamples();
733	cgGLSetParameterArray2f(sSamplesGiParam, 0, NUM_SAMPLES, (const float *)samples);
734	}
735	else
736	{
737	cgGLSetParameter1f(sExpFactorGiParam, 1.0f);
738	}
739
740	Vector3 tl, tr, bl, br;
741	ComputeViewVectors(tl, tr, bl, br);
742
743	glColor3f(1.0f, 1.0f, 1.0f);
744
745	glBegin(GL_QUADS);
746
747	// note: slightly larger texture hides ambient occlusion error on border but costs resolution
748	//const float new_offs = 0.55f;
749	const float new_offs = 0.5f;
750
751	glColor3f(bl.x, bl.y, bl.z); glTexCoord2f(0, 0); glVertex3f(-new_offs, -new_offs, -0.5f);
752	glColor3f(br.x, br.y, br.z); glTexCoord2f(1, 0); glVertex3f( new_offs, -new_offs, -0.5f);
753	glColor3f(tr.x, tr.y, tr.z); glTexCoord2f(1, 1); glVertex3f( new_offs, new_offs, -0.5f);
754	glColor3f(tl.x, tl.y, tl.z); glTexCoord2f(0, 1); glVertex3f(-new_offs, new_offs, -0.5f);
755
756	glEnd();
757
758	cgGLDisableTextureParameter(sColorsTexGiParam);
759	cgGLDisableTextureParameter(sPositionsTexGiParam);
760	cgGLDisableTextureParameter(sNormalsTexGiParam);
761	cgGLDisableTextureParameter(sNoiseTexGiParam);
762	cgGLDisableTextureParameter(sOldSsaoTexGiParam);
763	cgGLDisableTextureParameter(sOldIllumTexGiParam);
764
765	FrameBufferObject::Release();
766
767	PrintGLerror("globillum first pass");
768	}
769
770
771	void SsaoShader::CombineIllum(FrameBufferObject *fbo)
772	{
773	GLuint colorsTex = fbo->GetColorBuffer(3)->GetTexture();
774
775	GLuint ssaoTex = mNewFbo->GetColorBuffer(0)->GetTexture();
776	GLuint illumTex = mNewFbo->GetColorBuffer(1)->GetTexture();
777
778	fbo->Bind();
779
780	// overwrite old color texture
781	glDrawBuffers(1, mymrt);
782
783	cgGLEnableProfile(RenderState::sCgFragmentProfile);
784
785	cgGLBindProgram(sCgCombinedIllumProgram);
786
787	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
788
789
790	cgGLSetTextureParameter(sColorsTexCombinedIllumParam, colorsTex);
791	cgGLEnableTextureParameter(sColorsTexCombinedIllumParam);
792
793	cgGLSetTextureParameter(sSsaoTexCombinedIllumParam, ssaoTex);
794	cgGLEnableTextureParameter(sSsaoTexCombinedIllumParam);
795
796	cgGLSetTextureParameter(sIllumTexCombinedIllumParam, illumTex);
797	cgGLEnableTextureParameter(sIllumTexCombinedIllumParam);
798
799	glColor3f(1.0f, 1.0f, 1.0f);
800
801	const float offs = 0.5f;
802
803	glBegin(GL_QUADS);
804
805	glTexCoord2f(0, 0); glVertex3f(-offs, -offs, -0.5f);
806	glTexCoord2f(1, 0); glVertex3f( offs, -offs, -0.5f);
807	glTexCoord2f(1, 1); glVertex3f( offs, offs, -0.5f);
808	glTexCoord2f(0, 1); glVertex3f(-offs, offs, -0.5f);
809
810	glEnd();
811
812	cgGLDisableTextureParameter(sColorsTexCombinedIllumParam);
813	cgGLDisableTextureParameter(sSsaoTexCombinedIllumParam);
814	cgGLDisableTextureParameter(sIllumTexCombinedIllumParam);
815
816	cgGLDisableProfile(RenderState::sCgFragmentProfile);
817
818	FrameBufferObject::Release();
819
820	PrintGLerror("combine");
821	}
822
823
824	void SsaoShader::CombineSsao(FrameBufferObject *fbo)
825	{
826	GLuint colorsTex = fbo->GetColorBuffer(3)->GetTexture();
827	GLuint ssaoTex = mNewFbo->GetColorBuffer(0)->GetTexture();
828
829	fbo->Bind();
830
831	// write into old color texture (not needed anymore)
832	glDrawBuffers(1, mymrt);
833
834	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
835
836	cgGLEnableProfile(RenderState::sCgFragmentProfile);
837
838	cgGLBindProgram(sCgCombinedSsaoProgram);
839
840	cgGLSetTextureParameter(sColorsTexCombinedSsaoParam, colorsTex);
841	cgGLEnableTextureParameter(sColorsTexCombinedSsaoParam);
842
843	cgGLSetTextureParameter(sSsaoTexCombinedSsaoParam, ssaoTex);
844	cgGLEnableTextureParameter(sSsaoTexCombinedSsaoParam);
845
846
847	glColor3f(1.0f, 1.0f, 1.0f);
848
849	const float offs = 0.5f;
850
851	glBegin(GL_QUADS);
852
853	glTexCoord2f(0, 0); glVertex3f(-offs, -offs, -0.5f);
854	glTexCoord2f(1, 0); glVertex3f( offs, -offs, -0.5f);
855	glTexCoord2f(1, 1); glVertex3f( offs, offs, -0.5f);
856	glTexCoord2f(0, 1); glVertex3f(-offs, offs, -0.5f);
857
858	glEnd();
859
860	cgGLDisableTextureParameter(sColorsTexCombinedSsaoParam);
861	cgGLDisableTextureParameter(sSsaoTexCombinedSsaoParam);
862
863	cgGLDisableProfile(RenderState::sCgFragmentProfile);
864
865	FrameBufferObject::Release();
866
867	PrintGLerror("combine ssao");
868	}
869
870
871
872	} // namespace

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